The original number was: " 14 " .
____________________________________
a + 5 = b ;
b * 7 = 133 .
______________________________________________
What is: "a" ?
______________________________________________
133 / 7 = 19 = b ;
a + 5 = b = 19 ;
a + 5 = 19 ;
Subtract "5" from each side of the equation;
to isolate "a" on one side of the equation; and to solve for "a" ;
_______________________________________________
a + 5 − 5 = 19 − 5 ;
to get:
________________________________________________
a = 14 .
________________________________________________
Let us check our answer:
Start with "14" ;
Add "5" : "14 + 5 = 19 " .
______________________
then multiply by "7" : "19 * 7"
__________________________
and the result is: 133 ?
__________________________
19 * 7 = ? 133 ? Yes!
__________________________
Find the invers of f(x)
f(x) = 2x - 6
y = 2x - 6
y + 6 = 2x
2x = y + 6
x = (y + 6)/2
f⁻¹(x) = (x + 6)/2
Solve f⁻¹(x) for x = 2
Subtitute x with 2
f⁻¹(x) = (x + 6)/2
f⁻¹(x) = (2 + 6)/2
f⁻¹(x) = 8/2
f⁻¹(x) = 4
The answer is 4
Answer:
D
Step-by-step explanation:
1/2 ( 2x - 6) = -6
1/2 = 0.5
0.5(2x-6) = -6
1x-3=-6
1x=-6+3
x=-3/1
x=-3
